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प्रश्न
Give reason for the following:
Molybdenum is used in the manufacture of ammonia.
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उत्तर
Molybdenum increases the efficiency of the catalyst iron used in the manufacture of ammonia.
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संबंधित प्रश्न
How do the following help in bringing about a chemical change?
light.
Write the missing reactants and products and balance the equations.
NaOH + ............... `→` NaCI + ...................
TRUE \ FALSE
Copper can displace iron from iron sulphate.
Fill in the blank:
During a chemical reaction transfer of ________ takes place.
Copper carbonate when heated, it turns :
Give one example electrochemical reaction.
Match the following:
| 1. | Sodium Chloride | a. | CaSO41/2H2O |
| 2. | Calcium sulphate dihydrate | b. | C2H5Oh |
| 3. | Magnesium sulphate hydrate | c. | CaSO4.2H2O |
| 4. | Calcium sulphate hemihydrate | d. | NaCl |
| 5. | Phenol | e. | MgSO4.H2O |
Arrange the following statements in correct sequence:
- One side is water-loving and other water-hating molecules.
- When you agitate the cloth, the dirt is surrounded by many molecules and taken away from the cloth.
- The dirt surrounded by the detergent molecules floats in the water making it dirty.
- Finally, the cloth is clean.
- The detergent molecules have two sides.
- Water hating goes and joins with dirt and oil in the cloth while the water-loving joins with the water molecules.
Give two examples for the following case:
Chemical changes
A student took a solution of copper sulphate in a beaker and put a clean iron nail into it and left it for about an hour.
Are these changes chemical in nature?
